Synthesis and optical storage properties of a thiophene-based holographic recording medium

Matharu, Avtar S.; Jeeva, Shehzad; Huddleston, P. R.; Ramanujam, P. S.

doi:10.1039/b705648f

Cited by 30 publications

(19 citation statements)

References 16 publications

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“…Polymers containing azobenzene units (azo‐polymers) are of great interest owing to their potential application in optical data storage, optical switch, and electro‐optical modulators . Because of the reversible photoisomerization and photoinduced anisotropy of azobenzene chromophores, azo‐polymers can show a variety of photoresponsive variations, such as photoinduced surface‐relief‐gratings (SRGs) and photoinduced birefringence .…”

Section: Introductionmentioning

confidence: 99%

Fabrication of fluorescent holographic micropatterns based on the rare earth complexes using azobenzene-containing poly(aryl ether)s as macromolecular ligands

Zhang

Cui

et al. 2015

J. Polym. Sci. Part A: Polym. Chem.

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In this work, on the basis of photoinduced surface relief gratings (SRGs) with the rare earth complexes using azopolymers as macromolecular ligands, a series of novel materials for fabricating rewritable fluorescent two-dimensional micropatterns, whose color can be easily adjusted by changing the species of the rare earth ions, are demonstrated. The rare earth complexes are prepared using a series of poly(aryl ether)s containing azobenzene chromophores and carboxyl group as macromolecular ligands and 1,10-phenanthroline as co-ligands. The fluorescence properties of the rare earth complexes and the influence of the contents of azobenzene chromophores on the fluorescent intensity are investigated by means of fluorescence excitation and emission spectroscopy. By exposing the films of the rare earth complexes to an interference pattern laser beam, SRGs can be formed on the films. Under the excitation, fluorescent patterns of the SRGs can be observed by the measurement of fluorescence microscopy.

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Section: Introductionmentioning

confidence: 99%

Fabrication of fluorescent holographic micropatterns based on the rare earth complexes using azobenzene-containing poly(aryl ether)s as macromolecular ligands

Zhang

Cui

et al. 2015

J. Polym. Sci. Part A: Polym. Chem.

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“…More recently, amorphous molecular materials containing azo chromophores have also been used for SRG studies, which show a fast SRG forming rate and large surface modulation. [19][20][21] Polymer brushes refer to polymeric chains grafted on surfaces, which are prepared by methods such as controlled radical polymerization. [ 22 , 23 ] Functionalizing graphene with azo polymer brushes can combine the photoresponsive properties of azo polymers with the interesting properties of graphene.…”

mentioning

confidence: 99%

Graphene Functionalized with Azo Polymer Brushes: Surface‐Initiated Polymerization and Photoresponsive Properties

Wang¹,

Ye²,

Wang³

et al. 2011

Advanced Materials

119

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Since it was fi rst successfully prepared as a true two-dimensional nanomaterial, graphene has attracted tremendous attention for its unique structure and outstanding properties. [ 1 , 2 ] Graphene is one of the best candidates for numerous applications in functional devices such as gas sensors, [ 3 ] photovoltaics, [ 4 ] and fi eld-effect transistors. [ 5 ] The versatile approach of chemical modifi cation on the graphene basal planes or edges affords nanomaterials with additional novel functions. [ 6 ] If chemically modifi ed graphene is used as a fi ller, the electrical, thermal, and mechanical properties of polymer-based nanocomposites can be dramatically enhanced at a very low fi ller content. [ 7 , 8 ] Recently, the optical properties of single-layered graphene have aroused considerable research interest. [9][10][11][12][13] Although the refl ection and transmission of graphene have been intensively studied, little is known about the effect of graphene on the optical properties of the nanocomposites. Graphene has a two-dimensional (2D) ordered structure with unique electronic band structure, in which the conduction band touches the valence band at two points in the Brillouin zone. [ 9 , 10 ] Electrons in 2D structures behave like massless Dirac fermions and could show unique interactions with electromagnetic fi elds. Graphene possesses visual transparency, defi ned by the fi ne structure constant, with high transparency (97.7%) and refractive index (2.6-3) in the visible light range. [9][10][11][12][13] In view of these unique characteristics, the interaction between light and the nanocomposite fi lms could be a subject with great scientifi c signifi cance, and the results could be used to improve upon conventional polymers and other organic materials for optical applications.In this Communication, we report the preparation of singlelayered graphene grafted with azo polymer brushes and its interesting use to signifi cantly enhance the diffraction efficiency (DE) of photoinduced surface-relief gratings (SRGs) on azo molecular glass fi lms. The chemical structures of the functionalized graphene (G-PCN) and azo molecular glass (TrAz-CN) used in this work are shown in Figure 1 . Azobenzene and its derivatives are well-known for their reversible trans-cis isomerization induced by light irradiation. [ 14 ] Polymers containing azobenzene or its derivatives (azo polymers for short) have been intensively investigated for their photoresponsive properties and potential applications in diffractive optical elements, information storage, optical switching, nonlinear optics, sensors, and actuators. [ 15 , 16 ] SRG formation is a reversible surface modulation related to mass transport induced by irradiation with interfering laser beams. [ 17 , 18 ] It can be used as a one-step photofabrication method to prepare various surface patterns. More recently, amorphous molecular materials containing azo chromophores have also been used for SRG studies, which show a fast SRG forming rate and large surface modulation. [19][20][2...

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“…Experimentally, this would be averaged. Second, as was discussed for azobenzenes, [36][37][38][39][40][41][42][43][44] the energy path connecting the syn(cis) and anti(trans) isomers involves simultaneous flattening of NNC angle when the -C-N=N-C-dihedral angle is approaching 90 o (or 270 o ). Our DFT studies reveals analogous multidimensional character of reorganization in 3,3-AT and 3,3-ATM systems.…”

Section: Barrier For Syn(cis) To Anti(trans) Isomerizationmentioning

confidence: 96%

“…The anticipated value for azobenzene agrees well with the results of experimental 35 and theoretical studies, as reported. [36][37][38][39][40][41][42][43] Theory predicts that the syn(cis) to anti(trans) barriers of the azo-group in azothiophene systems are higher than the same barrier for azobenzene. Also, DFT suggests that the barrier for 3,3-AT is higher than that for 3,3-ATM.…”

Section: Barrier For Syn(cis) To Anti(trans) Isomerizationmentioning

confidence: 99%

“…This we may ascribe to possible interactions with solvent and to the multidimensional character of thermal isomerization. [37][38][39][40][41] , Taking slopes and intercepts in the Eyring plots, as shown in Fig. 5d, we calculate enthalpy and entropy for the transition states for the two molecules following syn(cis) to anti(trans) isomerization pathways.…”

Section: Barrier For Syn(cis) To Anti(trans) Isomerizationmentioning

confidence: 99%

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The structural and electronic properties of 3,3′-azothiophene photo-switching systems

Huddleston

Volkov

Perry

2019

Phys. Chem. Chem. Phys.

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Synthesis and optical storage properties of a thiophene-based holographic recording medium

Cited by 30 publications

References 16 publications

Fabrication of fluorescent holographic micropatterns based on the rare earth complexes using azobenzene-containing poly(aryl ether)s as macromolecular ligands

Fabrication of fluorescent holographic micropatterns based on the rare earth complexes using azobenzene-containing poly(aryl ether)s as macromolecular ligands

Graphene Functionalized with Azo Polymer Brushes: Surface‐Initiated Polymerization and Photoresponsive Properties

The structural and electronic properties of 3,3′-azothiophene photo-switching systems

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